Google Chromecast not playing with T-Mobile 5G

[Mikeinstlouis]

I just recently and unfortunately changed my Wi-Fi service to T-Mobile 5G. I'm trying to set up all my Google devices which are working fine except for my Chromecast. It keeps saying unable to authenticate Chromecast. I called T-Mobile and they suggested that I do a 2.4 band as well and that would not work either. My Chromecast is not even looking for Wi-Fi network or asking anything. It just wants me to take a picture and scan it and then it says could not authenticate. Where do I go from here because I'm ready to send back my T-Mobile.

I will be happy to answer any other questions! Thank you

[David_K]

If you've already changed to a different Wi-Fi network, try these steps:

1. Open the Google Home app.
2. At the top left, tap Add + > Set up device > New device > set up new devices in your home.
3. Follow the in-app steps.

If these steps above don’t solve the issue, you’ll need to factory reset your Chromecast, then set it up again using your new Wi-Fi network and password. If you're using Chromecast with Google TV, follow these setup steps instead.

Instead of factory resetting your Chromecast, if you're comfortable changing your router settings, you can change your new Wi-Fi network name and password in your router's settings to be the same as the previous ones. Your device should then automatically connect to the Wi-Fi.

[LovelyM]

Hello everyone, 

@David_K, thanks for the helping hand.

@Mikeinstlouis, I'm checking in to see if you've tried the steps above. I'd be glad to hear from you, so please tell me if you are still having issues.

Best,
Lovely

[Juni]

Hi there,

I want to check if you have additional questions and concerns about your device. Let us know by updating this thread, and we're glad to assist you further.
 

Thanks,

Juni

[Juni]

Hello there,
 

Just checking in to make sure that you saw our responses. I'll be locking this thread if we don't hear back from you again in 24 hours. Should that happen, feel free to create a new one if you have more questions or have other concerns in the future.
 

Best,

Juni